Human Health and Disease 🩺 | NCERT Animated Revision | NEET 2026 Quick Revision #neet2026 #biology

Hello. Just imagine, there is a war going on inside your body right now. This is your body's fight against millions of unknown enemies who are waiting to attack every moment. So let us understand every detail of this unique war today. So what is our battle plan for today? First of all we will understand what

health and disease are? Then we'll meet some common diseases. After that we will talk about the superhero of our body i.e. the immune system. We will look at innate and acquired immunity. We will learn how vaccination works and finally read about the HQs of the immune system i.e. its organs. So let's get started. First of all

it is important to understand what is this battlefield and who is the enemy? Meaning what is the real meaning of health? Often we think that if we are not sick then we are healthy. But the World Health Organization says that health means much more than this. This is a state where you feel completely fit physically, mentally and socially.

Remember, your productivity increases only when you are truly healthy. Due to which both you and the country progress. Think back to the earlier times, during the time of people like Hippocrates, there was a good humor hypothesis. He believed that there are four types of fluids or humors in the body and their balance is health. For example, a person who had

excess black bile was considered to be angry and had a fever. But then came William Harvey. He discovered blood circulation through experiments and disproved the Good Humor Theory forever. Today we know that our mind, our nervous system, endocrine system and immune system are all interconnected and together control our health. So what are those things that